So after almost killing my plants with no ventilation for 12 hours the seem to be coming back...but on all of the leaves.including new growth the ends are brown and dead. I do not use any fertilizer yet.(4days) in soil.... and my 400w hps is 2ft above the plants... wat could this be
More info is needed before you can get any real help. Temp, how old, soil and any other specifics and others can get a better idea of what the problem may be. Whats dead is dead and the abuse even when the issue is resolved takes time to bounce back.
i think they are burnt/dead from no venting for 12 hrs, remove the dead growth and as long as you keep an eye on them and make sure you grow environment is stable you should be fine